Liquid scintillator (LS) will be adopted as the detector material in JUNO (Jiangmen Underground Neutrino Observatory). The energy resolution requirement of JUNO is 3%, which has never previously been reached. To achieve this energy resolution, the light yield of liquid scintillator is an important factor. PPO (the fluor) and bis-MSB (the wavelength shifter) are the two main materials dissolved in LAB. To study the influence of these two materials on the transmission of scintillation photons in LS, 25 and 12 cm-long quartz vessels were used in a light yield experiment. LS samples with different concentration of PPO and bis-MSB were tested. At these lengths, the light yield growth is not obvious when the concentration of PPO is higher than 4 g/L. The influence from bis-MSB becomes insignificant when its concentration is higher than 8 mg/L. This result could provide some useful suggestions for the JUNO LS.

中文翻译：

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光输出对LAB液体闪烁体成分依赖性的初步研究

JUNO（江门地下中微子天文台）将采用液体闪烁体（LS）作为探测器材料。JUNO 的能量分辨率要求为 3%，这是以前从未达到的。为了实现这种能量分辨率，液体闪烁体的光输出是一个重要因素。PPO（荧光剂）和 bis-MSB（波长转换器）是溶解在 LAB 中的两种主要材料。为了研究这两种材料对 LS 中闪烁光子传输的影响，在光输出实验中使用了 25 和 12 厘米长的石英容器。测试了具有不同浓度 PPO 和 bis-MSB 的 LS 样品。在这些长度下，当 PPO 浓度高于 4 g/L 时，光产量增长不明显。当 bis-MSB 的浓度高于 8 mg/L 时，其影响变得微不足道。